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Cung Huu NGUYEN,Thi Truc Quynh PHAM,Thi Hoa TRAN,Thi Hoa NGUYEN 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.11
Foreign capital inflows play an essential role in each country’s socio-economic growth, particularly for undeveloped and developing countries where capital accumulation is limited in the early stages of development, and Vietnam is no exception. The purpose of this article is to examine the impact of foreign capital inflows on economic growth in Vietnam. The empirical method employed secondary time-series data set during the period 1995–2018 to determine the impact of FDI, foreign aid, foreign loans, and exports on economic growth in Vietnam by using a linear approach. For this study, data was collected from the World Bank and relevant agencies in Vietnam. The results show that FDI (net inflows), foreign aid, foreign loans, exports, and GDP (current), have a positive effect at a 1% significance level on economic growth. Rather, an increase in FDI (net inflows), foreign aid, foreign loans, exports has beneficial effects on the Vietnamese economy in the study period. Based on the findings of this study, the article proposes several important policy implications for Vietnam in maintaining a high rate of economic growth via the contribution of FDI inflows, foreign aid, foreign loans, and exports.
화학 반응기 네트워크 모델을 통한 희박 예혼합 연소기의 온도 및 NOx 생성 예측
신창훈(Changhun Sin),누엔후트럭(Truc Huu Nguyen),박정규(Jungkyu Park) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
Due to the hazard of exhaust gas, each country have there own regulations. To design gas turbines that comply with these regulations, accurate prediction and information on NOx generation is needed. The main objective of this research is to verify the CFD-CRN method by predicting the NOx generated by the lean premixed combustion method operating on CH₄ . In the CFD-CRN method, CRN is designed and calculated based on information such as the temperature, flow in the gas turbine obtained by the CFD simulation. In order to verify the CFD-CRN method, it was compared with actual experimental measurements. These experimental value were measured at specific equivalence ratios. The reaction pathway was analyzed to observe the formation and distruction of NOx.
Prediction of NOx Emission in Lean Premixed Gas Turbine Combustor Using a CFD - CRN Approach
Xiang Yu Hou,Seung Han Kim,Truc Huu Nguyen,Jung Kyu Park,Seung Chai Jung,Si Won Yang 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
This works developed chemical reactor network approach (CRN) with a short time and precise result to predict NOx emissions from a gas turbine rapidly and precisely to amend the defect of the computed time and precision with traditional CFD method for combustor designs. The chemical reactor network with 4 PSRs and 2 PFRs is developed here based on the computational fluid dynamics (CFD). The predictions of exhaust emission in this CRN approach were carried out by using CHEMKIN code and full GRI 3.0 chemical kinetic mechanism. The model combustor tests were conducted at different equivalence ratios. The predicted temperature and NOx emission results closely matched the experimental data. Also NO formation pathway analysis was carried out for the deep understanding of the relative contribution of four NO formation mechanism.
가스터빈 내의 NOx 예측을 위한 화학반응기 네트워크 모델 개발
김승한(Seunghan Kim),누엔 후 트럭(Nguyen Huu Truc),박정규(Jungkyu Park),정승채(Seungchae Jung),양시원(Siwon Yang) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In order to predict NOx and CO emission of lean premixed gas turbine, the chemical reactor network(CRN) is developed based on the computational fluid dynamics(CFD). The CRN consists of 16 chemical reactor elements which stand for different reaction zones of the combustor. The predictions of exhaust gas in this study were carried out by using CHEMKIN code and full GRI 3.0 chemical kinetic mechanism. The comparison of CRN prediction results and experimental results shows a reasonable agreement.
화학반응기 네트워크을 이용한 희박 예혼합 가스터빈 연소기에서의 오염물질 예측에 관한 연구
박정규(Jung-Kyu Park),누엔후트룩(Truc Huu Nguyen),이민철(Min-Chul Lee),정재화(Jae-Wha Chung) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.2
희박 예혼합 가스터빈 연소기에서 배출되는 NOx, CO 와 같은 오염물질을 예측하기 위해서 화학반응기 네트워크 모델을 개발했다. 본 연구에서는 CHEMKIN 코드와 4 가지 NO 생성 메커니즘을 포함한 GRI 3.0 메탄-공기 연소 메커니즘을 이용해서 가스터빈의 부하조건을 변화시키며 NOx 및 CO 배출의 예측을 수행하였다. 모델의 검증을 위해서 계산된 결과를 모사연소기의 실험 데이터와 비교하였다. 여러 부하조건에 따른 4 가지 NO 경로의 기여도를 조사하였다. 또한 인젝터의 질량유동 및 당량비의 불균일성이 NOx 배출이 끼치는 영향을 고찰하고 10ppm 이하의 저 NOx 연소기 개발을 위한 저감 방법을 제안했다. A chemical reactor network (CRN) was developed for a lean premixed gas turbine combustor to predict the emission of pollutants such as NOx and CO. In this study, the predictions of NOx and CO emissions from lean premixed methane-air combustion in the gas turbine were carried out using CHEMKIN and a GRI 3.0 methane-air combustion mechanism, which includes the four NO formation mechanisms for various load conditions. The calculated results were compared with experimental data obtained from a modified test combustor to validate the model. The contributions of the four NO pathways were investigated for various load conditions. The effects of nonuniformity of the mass flux and of the equivalence ratio of the injector on the NOx formation were investigated, and a method of reducing the pollutant formation was suggested for the development of a sub-10 ppm gas turbine combustor.
금속섬유 DPF 시스템 최적화를 위한 CFD 시뮬레이션 연구
진재민(Jaemin Jin),누엔 후 트럭(Nguyen Huu Truc),박정규(Jungkyu Park),이세영(Seyoung Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Diesel Particulate Filter (DPF) system is one of the promising methods to reduce diesel engine exhaust particulates which cause environmental pollution. Metal fiber DPF system cheaper and more enduarable than ceramic filter, the regeneration near the wall (outer layer) is difficult beause of the heat loss and the less gas flow rate near the wall. The uniform flow across the filter is very important to increase the regeneration efficiency of the DPF system. A 3D CFD simulation is performed to investigate the effects of major factors on the mass flow through the channel of each metal fiber filter layers. The major factors are change of filter porosity, various porosity of layer, distribution plate shape, size, location and swirler. The flow control by both of the distribution plate and swirler together was effective. In this work, the shape of the distribution plate and swirler are optimized through the CFD simulations.